Talmud su 'Avodah Zarah 2:8

⁴²He doubts the genuineness of the story. Since Rebbi Joḥanan lived a generation after Rebbi, his ruling has to be followed. Rav returned there and saw them taking things lightly and was restrictive with them. A man went to wash a piece of meat in the river. He forgot it and left. Then he went and wanted to sell it. Rav told him, it is forbidden to you, for I am saying the other one was carried away by the river and it brought another piece of carcass meat in its place. A man was carrying meat while walking on the market. There came a vulture, seized it from his hand, and dropped it off. He came back and wanted to sell it. Rav told him, it is forbidden to you, for I am saying that it was carrying carcass meat, dropped it and took the other instead.